重定义 UIImagePickerController

今天想实现一个类似Path 的Photo Picker的效果，没有Cancel按钮，取而代之的是添加一个从相册获取的按钮，要知道这在官方的SDK里面是没有。



开始之前，先做下功课，找到几个相关的文章

http://blog.airsource.co.uk/index.php/2008/11/11/views-of-uiimagepickercontroller/

http://www.cocoachina.com/bbs/read.php?tid-11664-page-1.html>

以下的这个框架图对接下来的工作会很有帮助




红色的高亮部分是从屏幕上看到的照片的预览图，除了这个之外，他上面的view都可以去掉。

要想编辑这些个View,得先找到他们,这里给出了个方法

#pragma mark get/show the UIView we want
//Find the view we want in camera structure.
-(UIView *)findView:(UIView *)aView withName:(NSString *)name{
Class cl = [aView class];
NSString *desc = [cl description];

if ([name isEqualToString:desc])
return aView;

for (NSUInteger i = 0; i < [aView.subviews count]; i++)
{
UIView *subView = [aView.subviews objectAtIndex:i];
subView = [self findView:subView withName:name];
if (subView)
return subView;
}
return nil;
}
怎么用，下面这段代码里给出了比较详细的例子

-(void)addSomeElements:(UIViewController *)viewController{
//Add the motion view here, PLCameraView and picker.view are both OK
UIView *PLCameraView=[self findView:viewController.view withName:@"PLCameraView"];
[PLCameraView addSubview:touchView];//[viewController.view addSubview:self.touchView];//You can also try this one.

//Add button for Timer capture
[PLCameraView addSubview:timerButton];
[PLCameraView addSubview:continuousButton];

[PLCameraView insertSubview:bottomBarImageView atIndex:1];

//Used to hide the transiton, last added view will be the topest layer
[PLCameraView addSubview:myTransitionView];

//Add label to cropOverlay
UIView *cropOverlay=[self findView:PLCameraView withName:@"PLCropOverlay"];
[cropOverlay addSubview:lblWatermark];

//Get Bottom Bar
UIView *bottomBar=[self findView:PLCameraView withName:@"PLCropOverlayBottomBar"];

//Get ImageView For Save
UIImageView *bottomBarImageForSave = [bottomBar.subviews objectAtIndex:0];

//Get Button 0
UIButton *retakeButton=[bottomBarImageForSave.subviews objectAtIndex:0];
[retakeButton setTitle:@"重拍" forState:UIControlStateNormal];

//Get Button 1
UIButton *useButton=[bottomBarImageForSave.subviews objectAtIndex:1];
[useButton setTitle:@"保存" forState:UIControlStateNormal];

//Get ImageView For Camera
UIImageView *bottomBarImageForCamera = [bottomBar.subviews objectAtIndex:1];

//Set Bottom Bar Image
UIImage *image=[[UIImage alloc] initWithContentsOfFile:[[[NSBundle mainBundle] bundlePath] stringByAppendingPathComponent:@"BottomBar.png"]];
bottomBarImageForCamera.image=image;
[image release];

//Get Button 0(The Capture Button)
UIButton *cameraButton=[bottomBarImageForCamera.subviews objectAtIndex:0];
[cameraButton addTarget:self action:@selector(hideTouchView) forControlEvents:UIControlEventTouchUpInside];

//Get Button 1
UIButton *cancelButton=[bottomBarImageForCamera.subviews objectAtIndex:1];
[cancelButton setTitle:@"取消" forState:UIControlStateNormal];
[cancelButton addTarget:self action:@selector(hideTouchView) forControlEvents:UIControlEventTouchUpInside];
}